maybe you can look into beeper. haven’t used it, but as i understand it’s a matrix server with all sort of bridges. I use the deposited version which works fine (at least as much as whatsnot allows it)

edit: just saw that somebody already wrote details about mautrix, which would be the self hosted solution.

if he remembers, what he did yesterday

Moorica add some cows

it’s not like he cares much about treaties that the us signed